<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width= device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
  </head>
  <body>
    <div id="app"></div>
    <script type="text/babel">
      class App extends React.Component {
        render() {
          return (
            <form>
              <p>
                请输入用户名
                <input type="text" ref="username" />
              </p>

              <p>
                请输入密码
                <input type="text" ref="password" />
              </p>

              <button onClick={this.formSubmit}>提交</button>
            </form>
          );
        }

        formSubmit = (e) => {
          //阻止默认事件
          e.preventDefault();
          console.log(this.refs.username.value, "用户名");
          console.log(this.refs.password.value, "密码");
        };
      }

      ReactDOM.createRoot(document.getElementById("app")).render(<App />);
    </script>
  </body>
</html>
